You maybe ok. I love the newer casting heads, but I see some guys running in the 11's with old doublehumps.
Be sure they are setup for unleaded fuel. Do a clean up and maybe have the valves redone with a new valve job.
And also I have heard guys tapping for accesory holes. Check with your local machine shop,but I have heard it being done.
383 Speed-O-Motive stroker kit with Speed Demon 750, RPM intake,Proform HEI dist.MSD6a box,World Products Sportsman II heads, ported and polished with 2.02/1.60 valves,64cc,TRW forged pistons with 10.7:1 compression, Comp Xtreme 284 cam,Crane pushrods, Comp Cam 1.6 full roller rockers,ATI damper, 40 series Flowmasters, 4.11 gears with TH350 and 3000 stall.Powertrax NoSlip Locker